Motor vehicle headlight including device for measuring deviation and adjusting direction of orientation of headlight beam

ABSTRACT

A headlight for a motor vehicle incorporation devices for measuring the amount of deviation of the beam of light produced thereby from the desired axis. The first deviation measuring device, which is used for measuring the amount of deviation of the beam in the horizontal direction, includes a calibrated rod extending between either the reflector and the headlight body, in the case of a movable reflector type headlight, or between the vehicle body and the headlight body, in the case of a movable unit type headlight. The second deviation measuring device, which is used for measuring the amount of deviation in the vertical direction, includes a level secured to the reflector or headlight body.

This is a divisional of application Ser. No. 07/370,949, filed Jun. 23,1989.

BACKGROUND OF THE INVENTION

The present invention relates to a motor vehicle headlight having adevice for measuring the amount of deviation of the light beam from theheadlight in vertical and horizontal directions from a proper aimingdirection.

A headlight is generally provided with an aiming mechanism for rotatablyadjusting the headlight about prescribed horizontal and vertical axes toadjust the direction of the optical axis of the headlight in such amanner as to align the light beam therefrom in a prescribed range. Forthis adjustment, the headlight is lit in a dark room, and the light beamfrom the headlight is shone onto a screen placed at a prescribeddistance therefrom. The headlight is then adjusted until the beam on thescreen is at a prescribed position.

For this adjustment, much equipment, such as a large dark room andscreen, is required. Moreover, it is time consuming to perform theadjustment because it is necessary to align the spot of the light beamwhile looking at the screen.

Headlights used in the United States have three location bosses, whichdefine measurement reference surfaces, projecting from the front lens ofthe headlight. To perform headlight alignment, a measuring instrumentcalled an "aimer" is set in contact with the location bosses to firstdetermine whether or not the headlight is inclined relative to ahorizontal plane. The headlight is attached to the motor vehicle in sucha manner that the front surfaces of the location bosses, which are themeasurement reference surfaces, extend vertically when the vehicle is ona horizontal surface. When the measuring instrument is set in contactwith the vertically extending front surfaces of the location bosses, theamount of inclination of the headlight relative to the horizontal planeis measured. It is required that the measured value be within aprescribed range.

To be able to carry out such measurements, every headlight used in theUnited States must have the above-described location bosses. Howeverdifferent alignment techniques are used in most other countries. Forthat reason, headlights for U.S. use must be manufactured separately anddifferently from those to be used in Japan, Europe, etc. This istroublesome and expensive.

SUMMARY OF THE INVENTION

The present invention was made in order to solve the above-discussedproblems. Accordingly, it is an object of the present invention toprovide a motor vehicle headlight having a device for measuring theamount of deviation of the orientation of the headlight withoutrequiring equipment such as a dark room, screen or aimer, yet which hasa simple construction and with which it can be easily confirmed whetheror not the direction of the light beam from the headlight deviates fromthe proper direction, and any deviation corrected.

There are generally two types of headlights for motor vehicles. One isthe movable reflector type in which a reflector, provided in the body ofthe headlight separately from the body, can be swingably moved foradjustment. The other of the headlight types is the movable unit type inwhich a reflector is integrally provided on the inside spherical surfaceof the body of the headlight and the body can be swingably moved foradjustment.

A device provided in accordance with the present invention for measuringthe amount of deviation of the orientation of a headlight of the movablereflector type is characterized by comprising a first deviationmeasuring unit Which includes support means projecting from the outsidesurface of the body of the headlight and a rod supported by the supportmeans, extending through the wall of the body of the headlight, andcontacting the rear surface of the reflector at one end of the rod undera spring force so as to be slid in the axial direction thereof dependingon the rightward or leftward deviation of the orientation of theheadlight, the amount of rightward or leftward deviation being measuredin terms of the position of the rod relative to the body of theheadlight: and a second deviation measuring unit which includes a bodyhaving a reflector-supported portion of the same form as thereflector-supported portion of the base of an electric bulb unitattached to the reflector and a level supported by the body of thesecond deviation measuring unit, the second deviation measuring unitbeing attachable to the reflector in place of the electric bulb unit inorder to measure the amount of upward or downward deviation of theorientation of the headlight.

In accordance with another aspect of the invention, a device formeasuring the amount of deviation of the orientation of a headlight ofthe movable unit type is characterized by comprising a first deviationmeasuring unit which includes support means projecting from theheadlight attaching surface of the body of the motor vehicle, and a rodsupported by the support means and contacting the outside surface of thebody of the headlight at one end of the rod under a spring force so asto be slid in the axial direction thereof depending on the rightward orleftward deviation of the orientation of the headlight, the amount ofrightward or leftward deviation being measured in terms of the positionof the rod relative to the headlight attaching surface: and a seconddeviation measuring unit which includes a body having a body-supportedportion of the same form as the body-supported portion of the base of anelectric bulb unit attached to the body of the headlight, and a levelsupported by the body of the second deviation measuring unit, the seconddeviation measuring unit being attachable to the body of the headlightin place of the electric bulb unit in order to measure the amount ofupward or downward deviation of the orientation of the headlight.

In the device provided in accordance with the present invention formeasuring the amount of deviation of the orientation of the headlight ofthe movable reflection type, the amount of deviation of the orientationof the reflector corresponds to the axial displacement of the rod of thefirst deflection measuring unit so that the quantity of the deviationcan be determined from the position of the rod relative to the body ofthe headlight. When the second deviation measuring unit is attached tothe reflector instead of the electric bulb unit, the amount of upward ordownward deviation of the orientation of the reflector can be determinedwith the level.

In the device provided in accordance with the present invention formeasuring the amount of deviation of the orientation of the headlight ofthe movable unit type, the amount of rightward or leftward deviation ofthe orientation of the body of the headlight corresponds to the amountof axial displacement of the rod of the first deviation measuring unit,and hence the amount of rightward or leftward deviation can bedetermined from the position of the rod relative to the headlightmounting surface of the body of the motor vehicle. When the seconddeviation measuring unit is attached to the body of the headlight inplace of the electric bulb unit, the amount of upward or leftwarddeviation of the orientation of the body of the headlight can bedetermined with the level.

The values measured by the first and second deviation measuring units ofeach of the devices can be easily made zero by the aiming adjustment ofthe headlight so as to correct any measured deviation of the orientationof the headlight.

Further, the invention provides a device for adjusting the direction ofthe light beam from a headlight of the movable reflector type comprisinga light beam direction adjusting mechanism by which a reflector providedin the body of the headlight is swung rightward, leftward, upward and/ordownward to adjust the direction of the light beam from the headlight; afirst deviation measuring unit including a support member provided atthe inside surface of the headlight body and a rod which is supported bythe support member so as to be slidable backward and forward in theaxial direction thereof and which is urged into contact with the rearsurface of the reflector at the front end of the rod by a spring so asto be slid forward or backward in the axial direction of the roddepending on the amount of rightward or leftward swing of the reflectorto thereby measure the amount of rightward or leftward deviation of theorientation of the reflector in terms of the position of the rodrelative to the headlight body; and a second deviation measuring unitwhich is a level secured to the reflector to measure the upward ordownward deviation of the orientation of the reflector. The first andthe second deviation measuring units are disposed in such a manner thatthe deviation amount reading areas (scales) of the units are located atthe upper portion of the reflector and face the upper part of theperipheral portion of the front lens of the headlight.

Yet further, the invention provides a device for adjusting the directionof the light beam from a headlight of the movable unit type comprising alight beam direction adjusting mechanism by which the body of theheadlight, the inside curved surface of which includes a lightreflecting surface, is swung rightward, leftward, upward and/or downwardto adjust the direction of the light beam from the headlight, a firstdeviation measuring unit including a support member provided at theheadlight mounting surface of the body of the vehicle and a rod which issupported by the support member so as to be slidable backward andforward in the axial direction thereof and which is urged into contactwith the rear surface of the headlight body at the front end of the rodby a spring so as to be slid forward or backward in the axial directionof the rod depending on the amount of rightward or leftward swing of theheadlight body to thereby measure the rightward or leftward deviation ofthe orientation of the headlight body in terms of the position of therod relative to the headlight mounting surface of the vehicle body: anda second deviation measuring unit which is a level secured to theheadlight body to measure the upward or downward deviation of theorientation of the headlight body. The first and second deviationmeasuring units are disposed in such a manner that the quantity readingareas (scales) of the units are located at the upper portion of theheadlight body.

In the above device provided in accordance with the present inventionfor adjusting the direction of the light beam from the headlight of themovable reflector type, the rightward or leftward deviation of theorientation of the reflector corresponds to the axial displacement ofthe rod of the first deviation measuring unit so that the amount ofrightward or leftward deviation can be determined in terms of theposition of the rod relative to the body of the headlight. The amount ofupward or downward deviation of the orientation of the reflectorcorresponds to the amount of axial displacement of the bubble of thelevel, which is the second deviation measuring unit, and hence thequantity of upward or downward deviation is indicated by the position ofthe bubble. The first and the second deviation measuring units areprovided at the upper portion of the reflector so that the deviationquantity reading areas of the units can be easily seen through the frontlens of the headlight. The direction of the light beam from theheadlight is adjusted by swingably adjusting the reflector rightward,leftward, upward and/or downward to place the graduation of the firstdeviation measuring unit and/or the graduation of the second deviationmeasuring unit into prescribed positions.

In the above device for adjusting the direction of the light beam fromthe headlight of the movable unit type, the amount of rightward orleftward deviation of the orientation of the body of the headlightcorresponds to the amount of axial displacement of the rod of the firstdeviation measuring unit so that the quantity of the rightward orleftward deviation is indicated in terms of the position of the rodrelative to the headlight mounting surface of the body of the vehicle.The amount of upward or downward deviation of the orientation of thebody of the headlight corresponds to the amount of axial displacement ofthe bubble of the level, which is the second deviation measuring unit,so that the amount of upward or downward deviation is indicated in termsof the position of the bubble. The first and the second deviationmeasuring units are disposed at the upper portion of the body of theheadlight so that the deviation quantity reading areas of the units canbe easily seen. The direction of the light beam from the headlight isadjusted by swinging the body of the headlight rightward, leftward,upward and/or downward to place the graduation of the first deviationmeasuring unit and/or the graduation of the second deviation measuringunit into prescribed positions.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a headlight of the movable reflector type;

FIG. 2 is a cutaway plan view of the headlight of FIG. 1;

FIG. 3 is a sectional view of the headlight taken along a line III--IIIshown in FIG. 1;

FIG. 4 is a horizontal sectional view of a first deviation measuringunit of a deviation measuring device of a first embodiment of thepresent invention;

FIG. 5 is a sectional view of the measuring unit taken along a line V--Vin FIG. 4;

FIG. 6 is a perspective view of the measuring unit;

FIG. 7 is a vertical sectional view of a contact surface of the frontend of the rod of the measuring unit;

FIG. 8 is a perspective view of the electric bulb unit of the headlight;

FIG. 9 is a perspective view of the bulb unit hole of the headlight andthe region in the vicinity thereof;

FIG. 10 is a perspective view of the locking cap of the headlight;

FIG. 11 is a perspective view of a second deviation measuring unit ofthe device;

FIG. 12 is a vertical sectional view of a headlight of the movable unittype;

FIG. 13 is a horizontal sectional view of the headlight shown in FIG.12;

FIG. 14 is a horizontal sectional view of a first deviation measuringunit of a deviation measuring device of another embodiment of thepresent invention;

FIG. 15 is a perspective view of the bulb unit hole of the body of theheadlight shown in FIG. 12;

FIG. 16 is a perspective view of the locking cap of the headlight shownin FIG. 12;

FIG. 17 is a front view of a headlight of the movable reflector type andin which another embodiment of a device of the present invention foradjusting the direction of the light beam from the headlight isprovided;

FIG. 18 is a plan view of the headlight of FIG. 17;

FIG. 19 is a sectional view of the headlight taken along a line XIX--XIXin FIG. 17;

FIG. 20 is a sectional view of the headlight taken along a line XX--XXin FIG. 17;

FIG. 21 is a vertical sectional view of the first deviation measuringunit of the device of FIG. 17;

FIG. 22 is a vertical sectional view of the portion of the headlight ofFIG. 17 at which the second deviation measuring unit of the device isprovided;

FIG. 23 is a sectional view of the second deviation measuring unit ofthe headlight of FIG. 17;

FIG. 24 is a sectional view of the second deviation measuring unit of adevice of another embodiment of the present invention and which is usedfor adjusting the direction of the light beam from a headlight of themovable reflector type;

FIG. 25 is a partial front view showing how mirror images of thegraduations of the second deviation measuring unit shown in FIG. 24 areseen through the front lens of the headlight; and

FIG. 26 is a horizontal sectional view of a headlight of the movableunit type and in which a device of yet another embodiment of the presentinvention for measuring and adjusting the direction of the light beamfrom the headlight is incorporated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the present invention are hereafter describedwith reference to the attached drawings.

FIGS. 1-11 show a deviation measuring device constructed according to afirst embodiment of the invention. FIG. 1 is a front view of a headlightof the movable reflector type and to which a first deviation measuringunit of the device is attached. FIG. 2 is a horizontal sectional view ofthe headlight. FIG. 3 is a vertical sectional view of the headlight.FIG. 4 is a horizontal sectional view of the first measuring unit. FIG.5 is a vertical sectional view of the first measuring unit. FIG. 6 is aperspective view of the first measuring unit in the state of beingassembled in the device. FIG. 7 is a vertical sectional view of asurface with which the front end of the rod of the unit comes intocontact. FIG. 8 is a perspective view of the electric bulb unit of theheadlight. FIG. 9 is a perspective view of the bulb unit hole of theheadlight and the region in the vicinity of the hole. FIG. 10 is aperspective view of the locking cap of the headlight. FIG. 11 is aperspective view of the second deviation measuring unit of the device.

As shown in FIGS. 1. 2 and 3, the headlight has a body 2 in which areflector 4 is provided. A front lens 6 is fitted to the rectangularfront opening of the body. As shown in FIGS. 2 and 3, the reflector 4 issupported at three points by a ball joint 10 and adjusting screws 20 and30. The reflector 4 is supported at the ball 12 of the ball joint 10 onthe headlight body 2 so that the reflector can be swung about the joint.The adjusting screws 20 and 30 are rotatably supported by the headlightbody 2 and engaged with nuts 22 and 32 at the side of the reflector 4 sothat the screws can be turned to be moved backward and forward along thenuts to change the orientation of the reflector. The ball 12 of the balljoint 10 is fitted in a socket member 14 secured to a bracket 16 fixedto the rear of the reflector 4. Other brackets 26 and 36 are secured tothe rear of the reflector 4 and support the nuts 22 and 32 engaged withthe adjusting screws 20 and 30. Compressed coil springs 24 and 34.O-rings 27 and 37 and flanges 28 and 38 projecting from the adjustingscrews 20 and 30 are further provided.

The point of support of the reflector 4 by the adjusting screw 20, whichcoincides with the joint of engagement of the screw and the nut 22, islocated on a horizontal axis L_(x) perpendicular to the optical axis lof the headlight and extending through the ball joint 10. The point ofsupport of the reflector 4 by the other adjusting screw 30, whichcoincides with the point of engagement of the screw and the nut 32, islocated on a vertical axis L_(y) perpendicular to the optical axis l andextending through the ball joint 10. Thus, the reflector 4 can be swungabout the vertical axis L_(y) by turning the adjusting screw 20 toadjust the orientation of the reflector rightward or leftward, and hencethe direction of the light beam from the headlight rightward orleftward. Also, the reflector 10 can be swung about the horizontal axisL_(x), perpendicular to the vertical axis, by turning the otheradjusting screw 30 to adjust the orientation of the reflector upward ordownward, and hence the direction of the light beam upward or downward.

As shown in FIGS. 1, 2 and 3, the body 2 of the headlight has a sealinggroove 3 around the front opening of the body, the peripheral portion ofthe front lens 6 is engaged in the groove, a sealing agent 3a is filledin the groove, and a clip 7 is fitted on the front lens and theheadlight body to clamp them to one another.

Shown at 40 in FIGS. 1, 2, 4, 5, 6 and 7 is the first deviationmeasuring unit for measuring the amount of rightward or leftwarddeviation of the orientation of the reflector 4, that is, the amount ofrightward or leftward deviation of the direction of the light beam fromthe proper aiming direction. The outer cylindrical casing 42 of the unit40 is provided on the headlight body 2 at a hole 41 provided in theheadlight body projecting therefrom. The outer casing 42 has acylindrical portion 42a extending from the headlight body 2 and asemicylindrical portion 42b located below the axis of the casing. Theinner cylindrical transparent casing 44 of the unit 50 is provided inthe outer casing 42 and extends through the wall of the headlight body2. The portion 44b of the inner casing 44, which corresponds to thesemicylindrical portion 42b of the outer casing 42, is shaped as a tubeof rectangular cross section. A portion 44a of the inner casing 44,which corresponds to the cylindrical portion 42a of the outer casing 42,is provided with a disk-shaped flange 44a. An O-ring 43 is fitted on theperipheral surface of the flange to seal the gap between the inner andthe outer casings 44 and 42. The other portion 44c of the inner casing44, which corresponds to the cylindrical portion 42a of the outer casing42, is a small cylindrical portion fitted in the hole 41 of theheadlight body 2 and is provided with three engagement projections 44don the outside circumferential surface of the small cylindrical portionat the front end thereof.

When the inner casing 44 is to be secured to the headlight body 2, theengagement projections 44d are put into the engagement recesses 41a ofthe inside circumferential surface of the headlight body around the hole41, the inner casing 44 is inserted into the hole to move theprojections out of the recesses into the interior of the headlight body,and the inner casing is finally turned.

The portion 44b shaped as a tube of rectangular cross section is markedwith a reference line 45 on the top of the portion as shown in FIG. 6.As shown in FIG. 4, the stepped rod 46 of the first deviation measuringunit 40 is fitted in the inner casing 44 so that the rod is slidable inthe axial direction thereof. A compressed coil spring 48 is interposedbetween the end face of the large-diameter portion 46a of the rod 46 andan end plate 49 and urges the rod so that the small-diameter portion 46bof the rod is held in contact with the bracket 26 disposed behind thereflector 4. As shown in FIGS. 1 and 2, the stepped rod 46 extendsparallel to the optical axis l and perpendicularly to the horizontalaxis L_(x). The point of contact of the small-diameter portion 46b ofthe rod 46 with the bracket 26 is located near the horizontal axisL_(x). If the position of the bracket 26 secured to the reflector 4 ischanged, that of the stepped rod 46 is altered in the axial directionthereof in proportion to the amount of the displacement of thereflector. The rod 46 is provided with graduations 47 as shown in FIG.4, so that a reference graduation 47a, which is one of the graduations47, is coincident with the reference line 45 on the inner casing 44 whenthe reflector 4 is properly positioned such that the orientation of thereflector, that is, the optical axis of the reflector, does not deviaterightward nor leftward from the desired direction or orientation. Forthat reason, the amount of rightward or leftward deviation of theorientation of the reflector 4, namely, the amount of rightward orleftward deviation of the direction of the light beam from theheadlight, can be determined from the difference between the referencegraduation 47a on the rod 46 and the reference line 45 on the innercasing 44.

As shown in FIG. 7, the portion 27 of the surface of the bracket 26,which is in contact with the front end of the small-diameter portion 46bof the stepped rod 46, is a spherical surface, the center of curvatureof which is coincident with the point P₁ of intersection of the axis ofthe rod and the horizontal axis L_(x). The surface of the front end ofthe bracket 26 is also a spherical surface corresponding to that of thebracket 26 so that the position of the rod 46 in the axial directionthereof is not affected by swinging the reflector 4 about the horizontalaxis L_(x) to adjust the direction of the light beam upward or downward.For that reason, the graduations 47 of the first deviation measuringunit 40 are not displaced by the upward or downward swinging movement ofthe reflector 4 for adjustment, but are displaced by the rightward orleftward swing of the reflector. The front end 46c of the large-diameterportion 46a of the stepped rod 46 acts as a stopper to prevent the rodfrom coming off the headlight body 2.

As shown in FIGS. 2, 8 and 9, the electric bulb unit 50 is fitted in thebulb unit hole 5 of the rear portion of the reflector 4. The bulb unithole 5 is defined by a rear annular part 5a surrounding the hole, afront annular part 5b surrounding the hole, and three inner projections5c provided on the inside circumferential surface of the front annularpart. Outer projections 5d are provided on the outside circumferentialsurface of the rear annular part 5a at the rear end thereof to securethe locking cap 60. The electric bulb unit 50 includes an electric bulb51, which produces the light beam, and a base 52 holding the bulb andhaving a cylindrical body 53 made of a synthetic resin and provided witha flange 54 extending along the circumference of the body. The base 52also has a connector 55 extending from the rear of the flange 54. Thetop of the connector 55 is a horizontal surface 55a. Terminals (notshown in the drawings) project within the connector 55. The bulb 51 andthe base 52 are cylindrically shaped, except for the connector 55. Thebase body 53 has a front portion 56 of small diameter and anintermediate portion 57 of middle diameter, which have outsidecircumferential surfaces 53a and 53b different in diameter from eachother. The base body 53 also has a rear portion 58 of large diameter.The portions 56, 57 and 58 of the base body 53 are held in the bulb unithole 5. The intermediate portion 57 has longitudinal slits 57a intowhich the inner projections 5c provided around the bulb unit hole 5 areengaged in the axial direction thereof. The rear portion 58 has anannular groove 58a in which an O-ring 59 is fitted.

When the electric bulb unit 50 is to be fitted in the bulb unit hole 5of the reflector 4, the circumferential positions of the longitudinalslits 57a of the intermediate portion 57 are made coincident with thoseof the inner projections 5c located around the bulb unit hole, and thebulb unit is then pushed into the hole until the flange 54 comes intocontact with the rear end of the rear annular part 5a to position thebulb unit. At that time, the gap between the rear annular part 5a andthe bulb unit 50 is sealed by the O-ring 59. The flange 54 has notches54a whose circumferential positions coincide with those of thelongitudinal slits 57a. The circumferential positions of the notches 54aare made coincident with those of the inner projections 5c to make itpossible to insert the bulb unit 50 into the bulb unit hole 5 to locatethe bulb unit at the proper position.

The locking cap 60 shown in FIGS. 2 and 10, which secures the electricbulb unit 50 in the bulb unit hole 5 of the reflector 4, has acylindrical portion 61 which is fitted on the outside circumferentialsurface of the rear annular part 5a surrounding the bulb unit hole 5.The locking cap 60 has flange pushers 64 projecting inward from theinside circumferential surface of the axially intermediate part of thecylindrical portion in the radial direction thereof and located atprescribed intervals in the circumferential direction thereof. Thecylindrical portion 61 has sliding projections 62 located at the frontend of the inside circumferential surface of the cylindrical portion andengaged with the outer projections 5d provided on the outsidecircumferential surface of the rear annular part 5a. After the electricbulb unit 50 is inserted into the bulb unit hole 5, the locking cap 60is placed around the rear annular part 5a and turned so that the slidingprojections 62 are engaged with the outer projections 5d. As a result,the flange 54 of the body 53 of the base 52 of the bulb unit 50 isclamped by the flange pushers 64 and the projecting end of the rearannular part 5a so that the bulb unit is secured in the bulb unit hole5.

As shown in FIGS. 2 and 9, another annular part 5e projects from theannular part 5a of the reflector 4. An annular rubber cover 70 isprovided between the annular part 53 and the rear open end 2a of theheadlight body 2 to close the gap between the reflector 4 and the rearend of the headlight body. When the locking cap 60 is attached to theheadlight body 2, an outer flange 66 provided on the cap at the rear endthereof pushes the radially inner portion of the rubber cover 70 ontothe rear end of the annular part 5e to prevent problems such asrainwater or the like entering into the headlight body 2 from the rear.Ribs 68 radially project from the outside circumferential surface of thecylindrical portion 61 of the locking cap 60, which can be used as gripsto easily attach and detach the cap to and from the headlight body 2.

Shown at 80 in FIG. 11 is the second deviation measuring unit, which isfitted in the bulb unit hole 5 of the reflector 4 when the unit is putin use. The unit 80 has a cylindrical base body 83 and a horizontalsurface 82a which is the top of the rear portion of the unit and whichcorresponds to the horizontal top 55a of the connector 55 of theelectric bulb unit 50. A level 90 is secured to the horizontal surface82a of the unit 80 so that the level is integrally coupled to the basebody 83 of the unit. In the level 90, a liquid and a bubble 91 arehermetically filled in a straight glass tube graduated with straightlines 92 located on the surface thereof at intervals in the axialdirection thereof. Except for the electric bulb 51 and the level 90, thesecond deviation measuring unit 80 and the electric bulb unit 50 havethe same outer configuration. The base body 83 of the unit 80 has aflange 54, notches 54a, a front portion 56 of small diameter, anintermediate portion 57 of middle diameter, longitudinal slits 57a, arear portion 58 of large diameter, and an O-ring 59, similar to theelectric bulb unit 50.

When the second deviation measuring unit 80 is to be used, the electricbulb unit 50 is removed from the bulb unit hole 5 of the reflector 4 andthe measuring unit is then fitted in the hole in the same way as thebulb unit. When the unit 80 is properly fitted in the hole 5, the level90 is located at the top of the base body 83 of the unit. If thereflector 4 is properly oriented vertically, namely, the position of theheadlight does not deviate upward or downward from the proper position,the bubble 91 of the level 90 will be located at a prescribed one of thestraight lines 92. If the position of the reflector 4 or the headlightdeviates upward or downward from the proper position thereof, the bubble91 will be shifted from the prescribed straight line 92 by a distancecorresponding to the amount of the deviation. For these reasons, it canbe easily confirmed by the second deviation measuring unit 80 whether ornot the position of the reflector 4 or the headlight deviates upward ordownward from the proper aligned position. The reflector 4 or theheadlight can be easily set in the proper position by turning theadjusting screw 30 to swing the reflector about the horizontal axisL_(x).

FIGS. 12, 13, 14, 15 and 16 show a deviation measuring device intendedfor measuring the deviation of the orientation of a headlight of themovable unit type. FIG. 12 is a vertical sectional view of theheadlight. FIG. 13 is a horizontal sectional view of the headlight. FIG.14 is a horizontal sectional view of the first deviation measuring unitof the device. FIG. 15 is a cutaway perspective view of the bulb unithole of the body of the headlight. FIG. 16 is a perspective view of thelocking cap of the headlight. In the headlight, a front lens 106 isattached to the front of the body 102 of the headlight, and a reflector104 is integrally provided on the inside spherical surface of theheadlight body. The front lens 106 is fitted in the sealing groove 103of the headlight body 102. A sealing agent 103a is filled in the sealinggroove 103. The headlight body 102 is supported at three points, namely,by a ball joint 110 and adjusting screws 120 and 130, to the body 100 ofa vehicle. The ball joint 110 and the adjusting screws 120 and 130correspond to those 10, 20 and 30 of the preceding embodiment. Theheadlight body 102 can be swung about the vertical axis L_(y) by turningthe adjusting screw 120 to adjust the direction of the light beam fromthe headlight rightward or leftward. The headlight body 102 can be swungabout the horizontal axis L_(x) by turning the adjusting screw 103 toadjust the direction of the light beam from the headlight upward ordownward. The screws 120 and 130 are engaged in bearings 122 and 132secured to the vehicle body 100 so that the screws are moved backwardand forward upon being turned. The screws 120 and 130 are provided withballs 124 and 134 at the front ends of the screws. The balls 124 and 134are fitted in the sockets 126 and 136 of brackets to constitute balljoints. The ball joint 110 and the adjusting screws 120 and 130 areessentially the same in constitution and operation as those 10, 20 and30 of the preceding embodiment, and are therefore not described infurther detail herein.

The first deviation measuring unit 140 of this embodiment is used formeasuring the amount of rightward or leftward deviation of the directionof the light beam from the headlight. The flange 142a of the outercylindrical casing 142 of the unit 140 is secured to the vehicle body100. The outer casing 142 has a semicylindrical portion 142b openupward. The inner transparent casing 144 of the unit 140 is shaped as atube of rectangular cross section and disposed in the outer casing 142coaxially therewith. The flange 144a of the inner casing 144 is clampedon that 142a of the outer casing 142 so that the casings are coupled toeach other. The stepped rod 146 of the unit 140 has a large-diameterportion 146a and a small-diameter portion 146b and is fitted in theinner casing 144 so that the rod is slidable in the axial directionthereof. A compressed coil spring 148 is interposed between the vehiclebody 100 and the large-diameter portion 146a of the stepped rod 146. Thesmall-diameter portion 146b of the rod 146 extends through an end plate149 and is in contact with the outside surface of the headlight body 102at the front end of the small-diameter portion. The inner casing 144 ismarked with a reference line 145 as shown in FIG. 13. The large-diameterportion 146a of the rod 146 is provided with the graduations 147 asshown in FIG. 14. The amount of the rightward or leftward deviation ofthe orientation of the headlight body 102, or that of the rightward orleftward deviation of the direction of the light beam from theheadlight, can be determined from the relationship between the referenceline 145 and the graduations 147 by the use of the first deviationmeasuring unit 140 in the same way as the preceding embodiment.

The portion of the surface of the headlight body 102 which is in contactwith the front end of the stepped rod 146 is a spherical surface, thecenter of curvature of which is coincident with the point ofintersection of the axis of the rod and the horizontal axis L_(x),similar to the first deviation measuring unit 40 of the precedingembodiment. As a result, the unit 140 is not affected by the upward ordownward deviation of the orientation of the headlight body 102.

A bulb unit hole 105 shown in FIG. 15 is provided in the headlight body102. The electric bulb unit 50 of the headlight is fitted in the bulbunit hole 105. The form of the hole 105 is entirely the same as that ofthe bulb unit hole 5, and a front annular part 5b, three innerprojections 5c and outer projections 5d are provided around the hole 105in the same manner as the preceding embodiment. Therefore, the bulb unithole 105, the front annular part 5b, the inner projections 5c and theouter projections 5d in the present embodiment are not described infurther detail herein.

Shown at 160 in FIGS. 13 and 16 is the locking cap which secures theelectric bulb unit 50 in the bulb unit hole 105. The form of the lockingcap 160 is essentially the same as that of the locking cap 60 of thepreceding embodiment. The same portions of the locking cap 160 as thoseof the locking cap 60 are denoted by the same reference symbols as thelatter and are not described in detail herein. The locking cap 160 hasan inner flange 164 for pushing the flange 54 of the electric bulb unit50. Although the locking cap 60 of the preceding embodiment has theouter flange 66 at the front end of the cap so as to push the rubbercover 70, the locking cap 160 of the present embodiment does not havesuch an outer flange because the headlight is not provided with such arubber cover. Also, the locking cap 160 does not have ribs such as those68 of the preceding embodiment.

The second deviation measuring unit 80 shown in FIG. 11 can be used withthe present embodiment. The unit 80 is fitted in the bulb unit hole 105of the headlight body 102 instead of the electric bulb unit 50 so as todetermine whether or not the orientation of the headlight body deviatesupward or downward, that is, whether the direction of the light beamfrom the headlight deviates upward or downward, and the amount of anysuch deviation. Therefore, the second deviation measuring unit 80 can beused not only for the headlight of the movable reflector type, but alsofor the headlight of the movable unit type.

In a device provided in accordance with the present invention to measurethe amount of deviation of the orientation of a headlight of the movablereflector type for a motor vehicle, the rightward or leftward deviationof the orientation corresponds to the axial displacement of the rod ofthe first deviation measuring unit of the device so that the amount ofrightward or leftward deviation can be determined in terms of theposition of the rod relative to the body of the headlight. When thesecond deviation measuring unit of the device is attached to thereflector of the headlight instead of the electric bulb unit, the amountof the upward or downward deviation of the orientation of the headlightcan be determined by the level of the second deflection measuring unit.For these reasons, it can be easily confirmed by a device of simpleconstruction whether or not the light beam from the headlight isoriented in the proper direction.

In a device provided in accordance with the present invention formeasuring the amount of deviation of the orientation of a headlight ofthe movable unit type for a motor vehicle, the amount rightward orleftward deviation of the orientation of the body of the headlightcorresponds to the amount of axial displacement of the rod of the firstdeviation measuring unit of the device so that the amount of therightward or leftward deviation can be determined in terms of theposition of the rod relative to the headlight mounting surface of thebody of the vehicle. When the second deflection measuring unit of thedevice is attached to the body of the headlight instead of the electricbulb unit, the quantity of the upward or downward deviation of theorientation of the body of the headlight can be measured using the levelof the unit. For these reasons, it can be easily confirmed by a deviceof simple construction whether or not the light beam from the headlightdeviates from the proper direction.

The values measured by the first and second deflection measuring unitsof each of the devices can be easily made zero by the aiming adjustmentof the headlight so as to correct any such deviation.

Further embodiments of the present invention are hereafter describedwith reference to the attached drawings.

FIGS. 17-25 show a device for adjusting the direction of the light beamfrom a headlight of the movable reflector type for a vehicle constructedin accordance with another embodiment of the invention. FIG. 17 is afront view of the headlight provided with the device. FIG. 18 is a planview of the headlight. FIG. 19 is a cutaway horizontal sectional view ofthe headlight. FIG. 20 is a vertical sectional view of the headlight.FIG. 21 is a vertical sectional view of a first deviation measuring unitof the device. FIG. 22 is a vertical sectional view of a part of theheadlight in which the second deviation measuring unit of the device isincorporated. FIG. 23 is a view for describing the assembled state ofthe second deviation measuring unit. FIG. 24 is a vertical sectionalview of the second deviation measuring unit of a direction adjustingdevice of still another embodiment of the invention. FIG. 25 is a viewshowing the mirror image of the second deviation measuring unit asthrough the front lens of the headlight.

Shown at 202 in the drawings is the body of the headlight whosereflector 204 is provided inside the body. The front lens 206 of theheadlight is attached to the headlight body 202 at the rectangular frontopening thereof so that the lens is integrally coupled to the headlightbody. As shown in FIGS. 17, 19 and 20, the reflector 204 is supported atthree points by a ball joint 210 and adjusting screws 220 and 230. Theball joint 210 is supported at the ball 212 thereof by the headlightbody 202 so that the reflector 204 can be swung about the ball joint.The adjusting screws 220 and 230 are rotatably supported by theheadlight body 202 and engaged in nuts 222 and 232 coupled to thereflector 204 so that the nuts can be moved forward or backward alongthe screws by turning the screws to change the orientation of thereflector 204. A socket member 214 supports the ball 212 of the balljoint 210 and is secured to a bracket 216 fixed to the rear surface ofthe reflector 204. The nuts 222 and 232 are supported by brackets 226and 236 secured to the rear surface of the reflector 204. Compressedcoil springs 224 and 234. O-rings 227 and 237, and flanges 228 and 238projecting from the adjusting screws 220 and 230 are also provided.

The point of support of the reflector 204 by the adjusting screws 220,which is the point at which the screw is engaged in the nut 222, islocated on a horizontal axis L_(x) perpendicular to the optical axis lof the electric bulb 241 of the headlight and extending through the balljoint 210. The point of support of the reflector by the other adjustingscrew 230, which is the point at which the screw is engaged in the nut232, is located on a vertical axis L_(y) perpendicular to the opticalaxis l and extending through the ball joint 210. With this construction,the reflector 204 can be swung about the vertical axis L_(y) by turningthe adjusting screw 220 to correct right or leftward deviation of theorientation of the reflector 202, that is, to adjust the direction ofthe light beam from the headlight rightward or leftward. The reflector204 also can be swung about the horizontal axis L_(x) perpendicular tothe vertical axis by turning the other adjusting screw 230 to correctupward or downward deviation of the orientation of the reflector, thatis, to adjust the direction of the light beam from the headlight upwardor downward.

Shown at 240 in FIG. 19 is a bulb socket member to which the electricbulb 241 is integrally coupled. The rear portion of the headlight body202 has a bulb socket member opening 202a through which the bulb socketmember 240 is fitted into the socket member hole 205 of the rear portionof the reflector 204. A rubber cover 246 is attached to the reflector204 around the socket member hole 205 thereof so that the gap betweenthe reflector and the headlight body 202 is closed. A locking cap 247 isprovided around the bulb socket member 240 so that the bulb socketmember is secured in the socket member hole 205 of the reflector 204 bypressure and the inner circumferential edge 246a of the rubber cover 246is tightly fitted on the circumferential part 204a of the rear portionof the reflector by pressure. A cylindrical connector 244, in whichterminals are provided, is coupled to the base 242.

Shown at 204 in FIGS. 19 and 20 is a sealing groove provided in theheadlight body 202 around the front opening thereof. The peripheralportion of the front lens 206 of the headlight is fitted in the sealinggroove 203. A sealing agent 203a is filled in the sealing groove 203. Aclip 207 mechanically clamps the front lens 206 onto the headlight body202.

Shown at 250 in FIGS. 17, 18, 19 and 21 is the first deviation measuringunit, which is mounted in a horizontal plane containing the horizontalaxis L_(x). The first deviation measuring unit is used to measure theamount of rightward or leftward deviation of the orientation of thereflector 204. A cylindrical projection 202b integrally formed on theheadlight body 202 extends into the recess 204a of the reflector 204located inside the headlight body. The recess 204a is located at theupper right-hand corner of the reflector 204. The first deviationmeasuring unit 250 is provided in the projection 202b and extendsparallel to the optical axis l. The unit 250 includes a cylindricalsupport member 252, a rod 254 inserted into the support member, and acompressed coil spring 256 provided in the support member and urging therod forward. A tapped member 251 is secured in the front end of theprojection 202b. The male screw of the support member 252, which is madeof a transparent synthetic resin, is engaged in the tapped member 251.The support member 252 has a large-diameter end portion 253 fitted withan O-ring 255 on the outside circumferential surface f the portion sothat the gap between the inside circumferential surface of theprojection 202b and the outside circumferential surface of the supportmember, which is slidable on the inside circumferential surface, isclosed. A cap 258 having a screwdriver-engaging portion 259 isfuse-bonded to the large-diameter end portion 253 of the support member252 so that the cap is integrally coupled thereto. With thisarrangement, the support member 252 can be turned relative to the tappedmember 251 using a screwdriver (not shown in the drawings) to move thesupport member backward and forward in the axial direction thereofrelative to the headlight body 202 to adjust the position of the supportmember. The rod 254 which is inserted in the support member 252 is astepped rod urged by the compressed coil spring 256 so that thesmall-diameter portion 261 of the rod projects forward in contact withthe rear surface of the vertical portion 204c of the reflector 204. Theoutside circumferential surface of the front end portion of the supportmember 252 is marked with a reference line 252a extending along thecircumference of the member. The small-diameter portion 261 of thestepped rod 254 is provided with straight graduations 262 located atpredetermined intervals in the axial direction of the rod. When thereflector 204 is swung about the vertical axis L_(y), the rod 254 isslid forward or backward in the axial direction thereof so that thepositional relationship between the reference line 252a and thegraduations 262 changes. As shown in FIG. 21, the portion 204c, of thesurface of the vertical wall 204c which is in contact with thesmall-diameter portion 261 of the stepped rod 254 is a curved surface,the radius of curvature of which is R and the center of curvature ofwhich lies on the horizontal axis L_(x). There, the graduations 262 ofthe first deviation measuring unit 250 are not displaced by upward ordownward deviation of the orientation of the reflector 204. Presettingis performed so that the position of the zero-indicating one 262a of thegraduations 262 is coincident with that of the reference line 252a whenthe reflector 204 is properly oriented rightward or leftward. Thegraduation 262 located at the reference line 252a indicates the amountof the rightward or leftward deviation of the orientation of thereflector 204. The reference line 252a for reading the graduations 262is located near the unstepped area 206a of the upper part of theperipheral portion of the front lens 206. As shown in FIG. 18, theinside surface of the peripheral portion of the lens 206 is providedwith diffusion steps S extending nearly parallel to the optical axis land located at prescribed intervals so that the leakage of light fromthe peripheral portion is not conspicuous. The area 206a of the upperpart of the peripheral portion of the front lens 206 is located so as tocorrespond to the first deviation measuring unit 250 and does not havesuch diffusion steps so that the positional relationship between thereference line 252a and the graduations 262, which corresponds to theamount of the rightward or leftward deviation of the orientation of thereflector 204, can be seen through the unstepped area 206a.

Shown at 270 in FIGS. 17, 18, 19 and 22 is the second deviationmeasuring unit, which is a level disposed in a horizontal planecontaining the horizontal axis L_(x) and which is used to measure theamount of upward or downward deviation of the orientation of thereflector 204. In the level 270, a liquid having a bubble 272 ishermetically filled in a straight transparent tube.

The reflector 204 has a recess 204b at the upper righthand corner of thereflector. The recess 204b has a horizontal bottom 204b. The level 270is secured at the bottom 204b₁ of the recess 204b so that the straightgraduations 274 of the level extend parallel to the optical axis l. Theend 270a of the level 270 is engaged in the engagement opening 276 ofthe vertical wall 204d of the reflector 204 at the recess 204b thereof.The level 270 is secured to the reflector 204 by screws 280a and 280b. Aplate spring 282 is interposed between the level 270 and the bottom204b, of the recess 204b. The degree of horizontality of the level 270can be adjusted by adjusting the screw 280a. Presetting is performed sothat the bubble 272 of the level 270 is located at the zero-indicatingone 274a of the straight graduations 274 when the reflector 204, or thelight beam from the headlight, is properly oriented upward or downward.The other unstepped area 206b of the upper part of the peripheralportion of the front lens 206 corresponds to the level 270 so that thepositional relationship between the bubble 272 of the level and thestraight graduations 274 thereof, which corresponds to the amount of theupward or downward deviation of the orientation of the reflector 204,that is, the amount of upward or downward deviation of the direction ofthe light beam from the headlight, can be seen through the unsteppedarea.

FIG. 24 shows the second deviation measuring unit of another embodiment.The portion of the reflector 204 on which the level 270 of the seconddeviation measuring unit is mounted is open at the front of the portionand formed with a plane mirror 204a with which the image of the bubbleand graduations of the level are reflected so that the reflected imagesof the bubble and the graduations can be seen through the unstepped area206c of the front lens 206 as shown in FIG. 25. As a result, thepositional relationship between the bubble and the graduations, whichcorresponds to the amount of the upward or downward deviation of theorientation of the reflector 204, can be observed looking through thefront lens 206.

The procedures for adjusting the first and the second deviationmeasuring units at the time of mounting of headlight to the body of thevehicle, and a procedure for adjusting the orientation of the headlightafter the adjustment of the measuring units will now be described.

If the zero-indicating graduation 262a of the rod 254 of the firstdeviation measuring unit 250 is made coincident with the reference line252a of the support member of the unit, the light beam from theheadlight prior to being mounted on the vehicle body will be properlyoriented rightward or leftward relative to the body of the headlight. Ifthe bubble 272 of the level 270, which is the second deviation measuringunit, is made coincident with the zero-indicating graduation 274athereof, the light beam from the headlight before mounting on thevehicle body will be properly oriented upward or downward relative tothe body of the headlight. When the headlight in which the first and thesecond deviation measuring units 250 and 270 are incorporated on thebody of the vehicle the graduations of the measuring units are notnecessarily located in proper positions because of dimensionalinaccuracies and the like, and therefore they must be adjusted to theproper positions. For the adjustment of the graduations of the firstdeviation measuring unit 250, an optical aimer is disposed to properlyface the body of the vehicle, and the optical axis of the headlight ismade coincident with the axis of the corresponding part of the vehiclebody by turning the adjusting screws 220 and 230. At that time, theposition of the reference line 252a of the unit 250 and that of thezero-indicating graduation 262a thereof do not necessarily coincide witheach other due to inaccuracies in the headlight mounting surface of thevehicle body or the like. The support member 252 of the measuring unit250 is then turned by the screwdriver so that the member is movedforward or backward in the axial direction thereof to cause the positionof the zero-indicating graduation 262a to coincide with that of thereference line 252a. The light beam from the headlight is thus properlyoriented rightward or leftward. As a result the graduation 262a,coincident with the reference line 252a in position, indicates the zeropoint of the first deviation measuring unit 250. When the headlight ismounted on the vehicle body, the position of the bubble 272 of thesecond deviation measuring unit 270 does not necessarily coincide withthat of the zero-indicating graduation 274a due to the inaccuracies ofthe headlight mounting surface of the vehicle body or to the like. Theadjusting screw 230 and, if necessary, the securing screw 280, are thenturned so that the position of the bubble 272 is made coincident withthat of the zero-indicating graduation 274a. The light beam from theheadlight is thus properly oriented upward or downward. As a result, thebubble 272 indicates the zero point of the second deviation measuringunit 270. If it is thereafter seen through the front lens 206 of theheadlight by the user that the position of the reference line 252a ofthe first deviation measuring unit 250 is not coincident with that ofthe zero-indicating graduation 262a thereof and/or the position of thebubble 272 of the second deviation measuring unit 270 is not coincidentwith that of the zero-indicating graduation 274a thereof, the user canread the amount of the rightward or leftward deviation and/or upward ordownward deviation of the orientation of the reflector of the headlight,or the amount of deviation of the direction of the light beam from theheadlight, in terms of the difference between the positions of thereference line 252 and the zero-indicating graduation 262a and/or thatbetween the positions of the bubble 270 and the zero-indicatinggraduation 274a. The user can turn the adjusting screw 220 to make theposition of the reference line 252a of the first deviation measuringunit 250 coincident with that of the zero-indicating graduation 262athereof to adjust the orientation of the reflector, namely, thedirection of the light beam from the headlight, rightward or leftward,and/or can turn the other adjusting screw 230 to make the position ofthe bubble 272 of the second deviation measuring unit 270 coincidentwith that of the zero-indicating graduation 274a thereof to adjust theorientation of the reflector or the direction of the light beam from theheadlight upward or downward.

FIG. 26 shows a device for adjusting the direction of the light beamfrom a headlight of the movable unit type constructed according to yetanother of the embodiments. In this device, a first deviation measuringunit 350 for measuring the amount of rightward or leftward deviation ofthe orientation of the body 302 of the headlight and a second deviationmeasuring unit 370 for measuring the amount of upward or downwarddeviation of the orientation of the body of the headlight are included,which units are disposed at the upper portion 302a of the headlight bodyand positioned in a horizontal plane containing the horizontal axisL_(x) about which the headlight body is swingably moved for adjustment.The first deviation measuring unit 350 includes a transparent supportmember 252 a holder 352 for attaching the support member to theheadlight mounting surface of the body 300 of the vehicle, and a rod 254provided with graduations and urged into contact with the vertical part304 of the upper portion 302a of the headlight body 302. The portion304a of the surface of the vertical part 304 which is in contact withthe small-diameter portion 261 of the rod 254 is a curved surface thecenter of curvature of which lies on the horizontal axis L_(x). For thatreason, the position of the rod 254 is not affected by swinging theheadlight body 302 upward and downward about the horizontal axis L_(x).The graduations of the first and the second deviation measuring units350 and 370 are located so that the graduations can be easily seen whenlooking downward through the peripheral portion of the headlight. Shownat 340 and 347 in FIG. 26 are an electric bulb socket member and alocking cap for securing the member in a socket member hole,respectively. Since the other portions of the device are the same inconstruction and operation as the above-described device for theheadlight of the movable reflector type, those portions are denoted bythe same reference numerals or symbols and are not described herein infurther detail.

In a device provided in accordance with the present invention foradjusting the direction of the light beam from a headlight of themovable reflector type, the amount of rightward or leftward deviation ofthe orientation of the reflector of the headlight corresponds to theamount of axial displacement of the rod of the first deviation measuringunit of the device so that the amount of rightward or leftward deviationof the orientation of the reflector can be determined in terms of theposition of the rod relative to the body of the headlight. The amount ofupward or downward deviation of the orientation of the reflectorcorresponds to the amount of axial displacement of the bubble of alevel, which forms the second deviation measuring unit of the device, sothat the amount of upward or downward deviation of the orientation ofthe reflector can be determined in terms of the position of the bubble.The first and the second deviation measuring units are disposed on theupper portion of the reflector so that they can be easily seen throughthe front lens of the headlight to judge whether or not the direction ofthe light beam from the headlight is proper. If the direction of thelight beam from the headlight is not judged to be proper, the directioncan be easily adjusted by swingably adjusting the reflector rightward orleftward to make the positions of the reference line and zero-indicatinggraduation of the first deviation measuring unit coincident with eachother, and/or by swingably adjusting the reflector upward or downward tomake the positions of the bubble and zero-indicating graduation of thesecond deviation measuring unit coincident with each other.

In a device provided in accordance with the present invention foradjusting the direction of the light beam from a headlight of themovable unit type for a motor vehicle, the amount of rightward orleftward deviation of the orientation of the body of the headlightcorresponds to the amount of axial displacement of the rod of the firstdeviation measuring unit of the device so that the amount of rightwardor leftward deviation of the orientation of the headlight body can bedetermined in terms of the position of the rod relative to the headlightmounting surface of the body of the vehicle. The upward or downwarddeviation of the orientation of the body of the headlight corresponds tothe amount of axial displacement of the bubble of a level, which formsthe second deviation measuring unit of the device, so that the amount ofupward or downward deviation of the orientation of the headlight bodycan be determined in terms of the position of the bubble. The first andthe second deviation measuring units are disposed on the upper portionof the headlight body so that they can be easily seen so as to judgewhether or not the direction of the light beam from the headlight isproper. If the direction of the light beam from the headlight is notjudged to be proper, the direction can be easily adjusted by swingablyadjusting the body of the headlight rightward or leftward to make thepositions of the reference line and zero-indicating graduation of thefirst deviation measuring unit coincident with each other, and/or byswingably adjusting the body of the headlight upward or downward to makethe positions of the bubble and zero-indicating graduation of the seconddeviation measuring unit coincident with each other.

While preferred embodiments of the invention have been described indetail, it will be evident to those skilled in the art that theinvention may be embodied otherwise without departing from its spiritand scope.

What is claimed is:
 1. A motor vehicle headlight, comprising:a headlightbody fixed to a body of a motor vehicle; a reflector positioned withinsaid headlight body and having a means provided therein for receiving anelectric bulb; means for mounting said reflector to said headlight bodyso that said reflector is pivotably adjusted about horizontal andvertical axes, said mounting means comprising a pivot mounting point forpivotally supporting said reflector to said headlight body, a firstadjusting means interconnecting said reflector to said headlight bodyfor adjusting an angular position of said reflector about said verticalaxis and a second adjusting means interconnecting said reflector to saidheadlight body for adjusting an angular position of said reflector aboutsaid horizontal axis, said first and second adjusting means beinghorizontally and vertically displaced from said pivot mounting pointalong said horizontal axis and said vertical axis, respectively; andfirst deviation measuring means for measuring an amount of rightward orleftward deviation of a beam emitted from said bulb from a predeterminedaxis, said first deviation measuring means being disposed along saidhorizontal axis between said pivot mounting point and said firstadjusting means.
 2. The motor vehicle headlight of claim 1, wherein saidfirst deviation measuring means is disposed proximate said firstadjusting means.
 3. The motor vehicle of claim 2, wherein said firstdeviation measuring means comprises rod means extending between saidheadlight body and a member fixed with respect to said headlight body,said rod means having one end in abutment with one of said headlightbody and said member fixed with respect to said headlight body, and saidrod means having graduation means associated therewith for measuringsaid amount of rightward or leftward deviation of said beam from saidpredetermined axis.
 4. The motor vehicle headlight of claim 1, furthercomprising second deviation measuring means for measuring an amount ofupward or downward deviation of said beam from said predetermined axis,said second deviation measuring means being disposed in a horizontalplane containing said horizontal axis.
 5. The device of claim 4, whereinsaid second adjusting means is disposed proximate said pivot point. 6.The device of claim 4, wherein said second deviation measuring meanscomprises a level coupled to said headlight body.